I did t get far into Dune (1) but what I can say is no one references it. Like ever. So it probably sucked to most people. Within days of Deadpool 3 coming out there were memes galore, YouTube shorts of the Madonna song over some other movies clip, etc etc.

Memes aren't everything but I've yet to see a single meme about either movie, or any kind of reference to it besides a direct discussion of the movie itself.

That alone tells me it was so bad it's not even memorable enough to joke about

Lotr on the other hand has countless meme template:

I have no memory of this place

Looks like meats back in the menu

How bout side by side with a....

Keep your secrets

Po ta toes

But they were all of them deceived

You have no power here....

What about second breakfast

One does not simply....

That's probably 10% of them and I know for a fact you could imagine and hear each one of those scenes in your head instantaneously.